Published on 12, July, 2020
2 members have PMd me saying they can't post so I don't know if this is a widespread problem.
I'd suggest emailing the community manager on:
communitymanager@nas.org.uk
I hope it gets sorted soon for you but today being a Bank Holiday, it's more likely to be looked at tomorrow +
I had the same issue over the weekend, having given up after I had three posts blocked in a row. It's fixed now for me, thankfully (after emailing in early yesterday).
Hopefully, this won't be a continuing issue once the forum has migrated to its new platform (next month).